Wall anchor



FIG. 1 is a front perspective view of a wall anchor embodying the design;

FIG. 2 is a front view of the design shown in FIG. 1;

FIG. 3 is a rear view of the design shown in FIG. 1;

FIG. 4 is a left side view of the design shown in FIG. 1;

FIG. 5 is a right side view of the design shown in FIG. 1;

FIG. 6 is a top plan view of the design shown in FIG. 1; and,

FIG. 7 is a bottom plan view of the design shown in FIG. 1.

The broken lines in the drawings illustrate portions of the wall anchor which form no part of the claimed design. 

CLAIM The ornamental design for a wall anchor, as shown and described. 